What happens if you leave broken arm untreated?

4 doctors weighed in

It depends on what you mean by treatment - many fractures are treated only with a sling such as upper humerus (upper arm) fractures and many fractures if non-displaced and in good alignment will heal very well with minimal immobilization.

In brief:
It depends

It depends on what you mean by treatment - many fractures are treated only with a sling such as upper humerus (upper arm) fractures and many fractures if non-displaced and in good alignment will heal very well with minimal immobilization.
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